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If it jams every time, remove the duplexer and look for a piece of paper on the metal plate as the paper feeds out of the duplexer and back into the machine. Also use a file folder to push any jammed paper out from inside the duplex module.
There are several thing which may cause unexpected jams in the duplex tray..., 1. first thing to do is eliminate all other possibilities by removing the netCard/Net connection Parralel connection so the machine is Stand Alone. make sure there is paper in the feed cassette 2 ( paper Tray) press the TICK to enter menu scroll down to diagnostic- press TICK scroll down to paper path test - press Tick scroll down to Source and select tray 2 scroll down to Duplex And select YES ( if the duplex option is not visible here then there is a connection/seating problem with the duplex tray) Scroll down to copies and select 10 scroll up to print test page and press tick the machine should now start duplexing 10 pages, if you get the same error ( 1 page enters then jams) it could be a dirty/snapped paper entry sensor,( looks like a little plastic match stick that protrudes into the feed path of the paper) use a can of pressurised air to Blast any dust away from this arm and the surrounding area being careful to follow the Paper sensor Arm back to the sensor and blasting this as well- Duplexer tray are cheaper than an engineer call out, if the fix above fails , your cheapest option may be a replacement Duplexer tray, available from most HP office equipment Stores as well as Belmonte Business Equipment.
The duplexer on this machine is mounted right on the top where the paper exits. It should have a clear paper guide on it. When duplexing,the paper comes out here, and then reenters the machine.I would try reseating the duplexer as I have had them dislodged by users sometimes when they are removing jams.
You've done everything I would have done and more. How about you installing a DOA duplexer. At this point I would change it again. Is there another printer that you can swap duplexers with? There is a paper path sensor test (letter H) and manual sensor test . I don't know if the Component test checks the duplexer, but you should be able to find out. Is the printer still under warranty? Can you call HP or are you an HP tech and you can call 2nd level support. Just a thought....when you run a Config sheet, does it show the duplexer?
Old age printer, prepare to replace the parts. Step 1: Clean all paper path sensor, replace paper pick up rollers, seperation pads, check with out duplexer unit.. Step 2: Even paper jamming replace fuser assembly.. Step 3: Check with duplexer unit, clean deolexer sensors & rollers..
This tells me your DUPLEXER is the one causing the jam, Ok like when you open the duplexer do you see the paper in their second does your copier indicae that the duplexer is in stalled ?m print the config page to verify. if it worked ok until this incident then your paper feed tires in your Duplexer is worn and needs to be replaced, do not do this yourself call a Service tech or A dealer to do so, uf your in CT we can help.
First, the machine always prints the first page first. Make sure you have the right driver (4 plus and not 4)and check the settings in the device settings of your printer driver on the pc. Also make sure the duplex unit is for the 4 plus and not the 4.